Classification The monophyly of the Hygrophila (Chilinoidea + Acroloxoidea + Lymnaeoidea + Planorboidea) is supported by the cladistic analysis of Barker (2001) and Dayrat et al. (2001), whereas neither the monophyly of the Thalassophila (= Amphiboloidea + Siphonarioidea) nor the monophyly of the Basommatophora is supported by these analysis. [details]